Patent DE-102010010337-A1 (DE)
Title: Marking device for eyeglass lenses made of plastic, comprises a laser with an exit lens present inside an optical axis for the laser beam to be delivered, and a deflector provided in a beam path after the exit lens
Inventor: SCHNEIDER GUNTER
IPC: B23K26/06
Filed: 2010-03-04
Abstract: The marking device (1) for eyeglass lenses (2) made of plastic, comprises a laser (3) with exit lens (3.2) present inside an optical axis (3.1) for a laser beam (3.3) to be delivered, and a deflector provided in a beam path after the exit lens, where the deflector ensures desired relative orientation between the laser beam and lens to be marked, to which an imaging optical unit connects itself for focusing the laser beam. The wavelength of the light to be delivered from the laser has 100-400 nm, 100-160 or 133 nm, 140-200 or 177 nm, 180-240 or 211 nm, 230-300 or 266 nm or 320-380 or 355 nm. The marking device (1) for eyeglass lenses (2) made of plastic, comprises a laser (3) with an exit lens (3.2) present inside an optical axis (3.1) for a laser beam (3.3) to be delivered, and a deflector provided in a beam path after the exit lens, where the deflector ensures a desired relative orientation between the laser beam and the lens to be marked, to which an imaging optical unit connects itself for focusing the laser beam. The wavelength of the light to be delivered from the laser has 100-400 nm, 100-160 or 133 nm, 140-200 or 177 nm, 180-240 or 211 nm, 230-300 or 266 nm or 320-380 or 355 nm. A solid body laser is provided with a neodymium dopant with an optical transformation unit for increasing the frequency. The marking device has an optical unit, by which the energy per laser pulse of the laser beam striking on the lens is reduced and which has optical beam splitters and/or filters, by which a part of the laser beam is guidable to the lens to be marked and a remaining part of the laser beam is deflectable or absorbable. The optical unit has a control unit, by which the measurement of the reduction of the specific optical radiation energy of the laser beam is variable independent of the material of the lens to be marked. The optical unit comprises a moving unit, over which an incident angle of the laser beam is changeable on the deflection element, so that the ratio between the part of the laser beam that is guidable to the lens to be marked and the remaining part of the laser beam is changeable independent of the incident angle. The beam splitters and/or filters have same or different optical properties, which are brought cumulatively or individually in the beam path, where the measurement of the suppression of the specific optical radiation energy of the laser beam attainable over the type and/or number of the used beam splitters is variable in 1-6 steps or in 2 steps. The suppression is 50-90% or a first step is provided with the suppression of 70-90% or 80-88% or 84% and a second step is provided with the suppression of 80-99% or 89-97% or 93%. A bulkhead and/or a radiation trap is provided for the laser light, in which the deflectable part of the laser beam is dischargeable. A reception is provided for the lens, where the reception has a moving axis with a directional component parallel to the laser beam. Independent claims are included for: (1) a method for marking contact lenses, intraocular lenses and/or eyeglass lenses made of plastic; and (2) a system.